[H] hd shipping clamshells?

[DSinc]

Can I store naked spare HD's in these cases WITHOUT the
prophylactic silver-gray ESD bag?

Have 2 Seagate hd shipping clamshell packages.
Marked:
100101492    3401  PJB-3

Circle w/3 arrows pointing in
Triangle w/1 inside

Wondering?
Best,
Duncan